Pump.



PATENTED cow. 1, 1907. I

W. B. BBB.

PUMP. APPLICATION FILED BEPT.2.190 5.

rn: mmms PETERS cc., wnsnmomh, n. c

' WILLIAM B. ERB, OF CHICAGO, ILLINOIS.

PUMP.

Specification of Letters Patent.

Patented Oct. 1, 1907.

Application filed September 2, 1905. Serial No. 276,784.

of pump rod to be lifted in the action of the pump,

and in which, therefore, the reduction of the weight of such rod to theminimum consistent with strength and stiffness necessary for its work isof importance, and any means of diminishing the requirement of stiffnesswithout incurring liability to bending or springing is of importance.

The invention consists of the features of construc-' tion set out in theclaims.

In the drawings:-Figure 1 is a vertical section of pump barrel and pumprod therein embodying my invention. Fig. 2 is a section at the line 22on Fig. 1. Fig. 3 is a section at the line 3-3 on Fig. 1. Fig. 4 is asection at the line 44 on Fig. 1. v

In the drawings, 1 represents the upper portion of the barrel of thepump in which the pistons operate, the same being sunken in the wellbore into waterbearing stratum, or at least so low as to be withinsucking distance of the water supply. The form of this barrel as shownis that which is fully described in my Patent No. 763,664, dated June28, 1904; and for the purpose of understanding the present invention itis not necessary to explain or describe the pump barrel or pistonstherein-further than to state that the construction is such as to causedouble action,that is, to lift the water by both the down stroke and theup stroke of the pump rod.

In the drawings, 2'represents the upper piston in the pump barrel. Thepump rod comprises, as mentioned, sections or lengths, as may benecessary according to the depth of the well, of standard tubing, 3, 3,3, 3, connected by standard couplings, 4, 4, 4,4, and the well tubingabove the barrel, 1, and up to within a short distance of the top,consists of as many lengths or sections as necessary of standard tubing,5, 5, 5, joined by standard couplings, 6, 6, 6. And in practice, in awell bore which will receive, for example, a two-inch (outside diameter)pump barrel, I employ for the tube standard one and one-half inch pipe,of which the couplings are somewhat less than two inches outsidediameter, and for the rod cooperating within this tubing I employstandard threefourths inch pipe of which the standard couplings areabout one and onefourth inch outside diameter, leaving only one-eighthof an inch all around the coupling inside the pipe.

The pipe sections, 3, constituting pump rod are perforated as indicatedat 3 to permit the water to pass in and out as the case may require.These perforations are preferably accumulated toward the opposite ends,that is, near the couplings,the total area of the entire group ofperforations near each end being at least equal to the annularcross-section of the coupling, 6,that is, to the obstruction which itoffers to the passage of water in the tube.

Near the top of the well bore the uppermost section of pipe, 5, isconnected by a reducer, 7, with a short section of pipe, 8, of largerdiameter, whose length is a little more only than the stroke of the pumprod; and within this upper section, 8, the uppermost tubular section, 3,of the pump rod is coupled to a solid steel rod, 9, by means of areducer, 10, whose upper end is of course completely closed by the rod,9, screwed thereinto, and whose cavity above the upper end of thetubular section, 3, which is screwed into the lower side of the couplingopens out to the surface of the coupling through a plurality ofapertures, 10, thus affording communication from the interior of thetubular portion of the pump rod with the space in said larger uppersection, 8, of-the pump tube above the coupling. The upper solidportion, 9, of the pump rod is adapted at the upper end to be connectedwith any device for reciprocating the pump rod'by motive power, and forthat purpose it extends up through the delivery chamber, 12, of the pumpand out through a stufling box, 13, at the upper side of said chamber, adischarge pipe, 14, leading from the chamber laterally.

For the purpose of permitting the ready withdrawal of the tubing fromthe well when desirable for repairs to any of the parts, the deliverychamber, 12, has at the bottom an aperture, 12, large cnough to permitthe largest element of the pump tubing, which is the coupling 7, to passfreely through it; and there is secured on to the upper end of the upperlarge section, 8, a flange, 15, reduced in diameter for a short distanceat the lower side to form a projecting nipple, 15, which enters theaperture, 12, and thereby centers the flange in the aperture, and whichhas on the downwardly facing surface of the shoulder which results fromthe reduction of diameter of said portion, 15, an annular groove, 15,which receives a packing ring which is held firmly seated upon the uppersurface of the lower wall of the chamber, 12, around the aperture, 12,by the weight of the pump tube, which it will be perceived is supportedthus directly on said lower wall of the delivery chamber at the marginof the aperture, 12*, on which said packing thus seats. The upper wallof the delivery chamber, 12, has an aperture, 12*, large enough topermit the flange, 15, to be withdrawn through it, and this aperture, 12is closed by a cap, 16, on.

which is formed the stuffing box, 13, above-mentioned, through which theupper solid element, 9, of the pump rod emerges for connection of thepower. Although the weight of the pump tubing will normally usually holdthe flange, 15, seated, as described, at the margin of the aperture, 12,it I is preferably bound fast in position by means of bolts, 17, 17, setthrough the cap, 16, and impinging upon the upper side of the flange.For withdrawing the pump tube, the cap, 16, will first be withdrawn overthe end of the pump rod and the flange, 15, will be engaged by means ofeyes, 15, 15, which are screwed into its upper side for that purpose,and the whole pump tube may thus be drawn through the delivery chamber.

By the employment of standard gages of tubing and coupling for both thepump tubing and the pump rod, the cost of construction is greatlycheapened, but this would be impracticable but for the employment of atubular pump rod, and the [low would be greatly impeded but for theperforation of the tubular rod between the couplings as described, forit will be seen that the capacity of the pump tube around the couplings,4, is very limited, and that especially during the descending stroke theamount of water which would ascend past the couplings outside the pumprod would be very much less than could be lifted in the upward movementwherein the water might be carried bodily along with the moving red; butby making the pump rod tubular, as described, and perforating it so thatthe water can pass freely into and out of it around the couplings theentire bore of the tubular rod becomes available for the movement of thewater in both strokes, and while the dimensions of the pistons may besuch that in the up-stroke none of the water carried in the tubular rodis discharged therefrom, in the down stroke the restriction of the outerpassage by the approximation of the diameter of the couplings on the rodto the inner diameter of the pump tubing forces the water to risethrough the rod in the bore thereof that in each interval between theconsecutive couplings is being forced through the perforations into theinner bore and is discharged through the top coupling, 10, into theupper large section, 8, of the tubing and lifted with the water whichhas passed up outside the pump rod into the discharge chamber.

It is not merely, however, for the purpose of reducing the cost ofconstruction that 1 employ the standard couplings on the tubular pumprod within standard pipe employed for the tubing, but it is especiallydesirable that the pump rod should at frequent intervals so closelyapproximate the wall of the pipe in which it is placed as to prevent itfrom buckling or bending in the down stroke, as is liable to happen if aslender rod is employed in considerable length without frequent guidebearings. To provide guide bearings would, of course, greatly diminishthe capacity of pump tubing of given bore, since only through aperturesin such bearings could water pass upward around the rod. But byemploying the couplings on the tubular rod of diameter so near to theinner diameter of the pipe as d escribedonly an eighth of an inchinterval all around the coupling being left in the pipeit will be seenthat I the tubular pump rod cannot bend or be deflected laterally exceptto the extent of such one-eighth of an inch in any two intervals orsections, and the utmost defiection from a straight line which can occurwill be that which will be involved in one coupling springing to oneside one-eighth of an inch from central position, while the nextcoupling, above or below, springs in the opposite direction an equaldistance. and this amount of dcllection. will not cause the tubularpump'rod to be bent or materially intcrl'crc with its pcrl'cct action.There is an additional advantage which is oblaincd by the approximatefcaturc ol' the couplings on the pump rod to the inner diameter of thepump tubing. (ontinuous use of any pump drawing watcr which carricsconsiderable amount of mineral, either in solution or in suspension,causes the formation of scale on the inside of the pipe, which not onlyrcduccs its U11ci;lll\c diameter but also is liable to injure the yalvcsby bccoming loosened and falling into the tube on to ihc valves in thepump barrel below. \\'hcn ihc cntirc water capacity of the pump tube isobiuincd oulsidc the pump rod, and when for that reason it is ncccssnryto construct the pump rod so that it docs not at any point very closelyapproximate the inner wall ol the pump tube, scale of this sort may formin considcrablc thickncss before it will bccomc dciucllcd, and the samccircumstance which permits it to form so llll(l* lll( comparatively wideintcrval necessary to be maintained between the pump-rod couplings andthe tube wall pcrmits such large fragments of scalc to fall to the pumpbarrel with the resulting danmgc abovc indicated. In the constructionherein dcscribcd, however, the couplings, l, on the tubular pump rod wrk at all tinics so close to thc inncr wall of thc tubc sometimestouching at one point and sometimes at anothcr in the circumfercncc ofthe tubing as the rod chances to spring one way or the other in lhc downslrolac. There couplings keep the inncr wall of rho lubc wipcd clean ofthe material which would form thc scale so that it is lit-pi; constantlyciihcr in suspcnsion in thc walcr and is carried up and dischargcd withit, or ii' occasionally apiccc of scale too heavy to be thus cnrricddocs have opportunity to be formed on the pipe bciorc it is wiped off bythe coupling, it is almost ccilain to bc chafed and ground between thepipe and two or morc couplings on the rod before it rcachcs ihc bottomand either is reduced to fragments too small to bc injurious or so smallas to be caught and lificd by tho asccnding current l.lcloi'e it reachesthc bottom. ln praclicc, therefore, 1 find that the construction .lluWcdcscribcd results in a clean tube and grcaily incrcascd life ol thevalves in the pump barrcl at the bottom.

I claim:-

1. 111 a well pump, in combination with the well tubing and the pumpcylinder at the lower end lhcreol', a tubular pump rod extending fromthe cylinder up within the well tubing, composed of lengths or sectionsof pipe and exterior couplings uniting 111011], the scycrul pipcsections of the tubular rod being uperturcd bolwoon Ibo couplings forthe pa age of water between the longitudinal cavity oi. the rod and thespace outside the sumo in the well tubing.

2. 111 a well pump, in combination wilh the well tubing and the pumpcylinder at the lower cnd thereof, a tubular pump rod extending from thecylinder up within the well tubing. composed of? lengths or sections ofpipe and exterior couplings uniting them, the several pipe sections olthe tubular rod being apertured between the couplings for the pa ge ofwater between the longitudinal carily of the rod and the space outsidethe sumo in the well tubing, the total area of the apertures in each ofsuid lengths or sections of pipe being :is great as the annular crosssection of the coupling or strucl ure which it presents to the passageof water through the well tubing.

l l. O

3. In a well pump, in combination with the well tubing and the pumpcylinder at the lower end thereof, a tubular pump rod connected with thecylinder consisting of lengths or sections of pipe and exteriorcouplings uniting them, the exterior diameter of the couplings beingonly slightly less than the interior diameter of the tubing, the severalsections or lengths of pipe constituting the rod being apertured betweenthe couplings for the passage of water into the rod to compensate forthe obstruction which the 10 couplings ofier to the passage of waterthrough the tubing outside the rod, and means at the upper end of therod for delivery of the water therefrom.

In testimony whereof, I have hereunto set my hand, in the presence oftwo witnesses, at Chicago, Illinois, this 28th day of August, 1905.

WM. B. ERB. Witnesses CHAS. S. BURTON, J. S. ABBOTT.

